/Engine/Source/Runtime/Engine/Classes/GameFramework/InputSettings.h
Hardware device id that represents a default, generic, mobile touch input (tablet, phone, etc)
static [FHardwareDeviceIdentifier](API\Runtime\Engine\GameFramework\FHardwareDeviceIdentifier) DefaultMobileTouch = { TEXT("DefaultMobileTouch"), TEXT("MobileTouch"), EHardwareDevicePrimaryType::Touch, EHardwareDeviceSupportedFeatures::Type::Touch };